要求如下:
在IP地址192.168.100.100主机上部署mysql服务
设置数据库管理员root本机登录密码为123QQ12@@a
关闭firewall 、禁用SELinux
配置yum源
步骤
实现此案例需要按照如下步骤进行。
步骤一:准备工作
如果之前有mariadb,则需要先卸载,并删除对应的配置与数据:
[root@localhost ~]# systemctl stop mariadb
2)删除/etc/my.cnf配置文件
此配置文件由RHEL自带的mariadb-libs库提供:
[root@localhost ~]# rm -rf /etc/my.cnf
3)删除数据
[root@localhost ~]# rm -rf /var/lib/mysql/*
卸载软件包(没有会显示未安装软件包)
[root@localhost ~]# rpm -e --nodeps mariadb-server mariadb
警告:/var/log/mariadb/mariadb.log 已另存为/var/log/mariadb/mariadb.log.rpmsave
步骤二:安装mysql软件包
解压MySQL-5.7.17.tar 软件包
[root@host100 ~]# tar -xvf mysql-5.7.17.tar
安装MySQL软件包
[root@host100 ~]# yum -y install mysql-community-*.rpm //yum安装自动解决依
赖
[root@host100 ~]#rpm -qa | grep -i mysql
3)启动MySQL数据库服务并设置开机自启
提示:第一次启动,需要初始化数据,会比较慢
[root@host100 ~]# systemctl start mysqld //启动mysql服务
[root@host100 ~]# systemctl enable mysqld //设置开机自启
[root@host100 ~]# systemctl status mysqld //查看mysql服务状态
[root@host100 ~]# netstat -utnlp | grep :3306 //查看服务信息
[root@host100 ~]# ps -C mysqld //查看进程
步骤三:连接MySQL服务器,修改密码
查看初始密码
[root@host100 ~]#grep –i 'password' /var/log/mysqld.log
2023-01-12T07:40:02.395977Z 1 [Note] A temporary password is generated for root@localhost: (yCYu((sj1M# //随机生成的管理密码为(yCYu((sj1M#
使用初始密码连接mysql服务
[root@host100 ~]# mysql -u root -p'(yCYu((sj1M#' //初始密码登录
mysql> //登录成功后,进入SQL操作环境
重置数据库管理员roo本机登录密码
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement //提示必须修改密码
mysql> alter user root@”localhost” identified by "123QQ12@@a"; //修改登陆密码
Query OK, 0 rows affected (0.00 sec)
mysql> exit //断开连接
[root@host100 ~]#
修改密码策略
[root@host50 ~]# mysql -uroot –p123QQ12@@a
mysql>
mysql>set global validate_password_policy=0; //只验证长度
Query OK, 0 rows affected (0.00 sec)
mysql>set global validate_password_length=6; //修改密码长度,默认值是8个字符
Query OK, 0 rows affected (0.00 sec)
mysql> alter user root@”localhost” identified by "tarena"; //修改登陆密码
Query OK, 0 rows affected (0.00 sec)
mysql>exit
[root@host100 ~]# mysql -uroot -p123QQ12@@a //登录
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.7.17 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
mysql> show databases; //查看数据库